It would be interesting to know the true energy consumption of swiping your credit card.. All the electricity to run the machines, power the facilities, gasoline consumed by the banking employees etc..

As far as the energy consumption with bitcoin transactions.. That's currently in the works. Its a new technology that will become more efficient over time

i dont think it will. at least with "mining" it's designed to become an increasingly difficult process to limit the bitcoin supply, meaning it will take more and more energy to incrementally add more bitcoin to the ecosystem